铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2014年
11期
36-40,41
,共6页
高速铁路%GPS%对流层延迟%框架控制网%分段线性法%参数估计
高速鐵路%GPS%對流層延遲%框架控製網%分段線性法%參數估計
고속철로%GPS%대류층연지%광가공제망%분단선성법%삼수고계
High - speed railway%GPS%Tropospheric delay%Frame control network%CP0%PWL%parameter estimation
对流层延迟是 GPS 测量的重要误差源之一，对模糊度解算及基线精度均有较大影响。高速铁路 CP0框架控制网基线解算中采用 PWL 分段线性法估计天顶对流层湿延迟参数的方法提高对流层折射改正精度，因此研究PWL 分段线性法中参数估计的时间间隔对 CP0基线解算的影响是十分必要的。介绍 GPS 对流层延迟的改正原理，通过设计不同解算方案采用工程测量数据对天顶对流层湿延迟参数估计的合理时间间隔进行研究。结果表明，每4~6 h 估计一个天顶对流层湿延迟参数效果较好，能真实反映出对流层折射影响随时间变化的趋势，从而提高基线解的精度。
對流層延遲是 GPS 測量的重要誤差源之一，對模糊度解算及基線精度均有較大影響。高速鐵路 CP0框架控製網基線解算中採用 PWL 分段線性法估計天頂對流層濕延遲參數的方法提高對流層摺射改正精度，因此研究PWL 分段線性法中參數估計的時間間隔對 CP0基線解算的影響是十分必要的。介紹 GPS 對流層延遲的改正原理，通過設計不同解算方案採用工程測量數據對天頂對流層濕延遲參數估計的閤理時間間隔進行研究。結果錶明，每4~6 h 估計一箇天頂對流層濕延遲參數效果較好，能真實反映齣對流層摺射影響隨時間變化的趨勢，從而提高基線解的精度。
대류층연지시 GPS 측량적중요오차원지일，대모호도해산급기선정도균유교대영향。고속철로 CP0광가공제망기선해산중채용 PWL 분단선성법고계천정대류층습연지삼수적방법제고대류층절사개정정도，인차연구PWL 분단선성법중삼수고계적시간간격대 CP0기선해산적영향시십분필요적。개소 GPS 대류층연지적개정원리，통과설계불동해산방안채용공정측량수거대천정대류층습연지삼수고계적합리시간간격진행연구。결과표명，매4~6 h 고계일개천정대류층습연지삼수효과교호，능진실반영출대류층절사영향수시간변화적추세，종이제고기선해적정도。
The refraction of the tropospheric delay on radio signals, which is one of the important error sources in GPS surveying, has great influences on the accuracy of ambiguity and baseline resolution. The method to estimate zenith tropospheric wet delay parameters of PWL model, which may be applied to CP0 baseline resolution of high-speed railway, improves the accuracy of the tropospheric delay correction effectively. Thus, it is necessary to conduct a research on the time interval selection of zenith tropospheric wet delay parameters of PWL model. In this paper, the principle of GPS tropospheric delay correction is introduced, and then surveying data in different resolution schemes are analyzed to determine a reasonable time interval of zenith tropospheric wet delay parameters of PWL model. The results show that the estimation of zenith tropospheric wet delay parameter every 4 to 6 hours has better baseline resolution effect, which truly indicates the trend of changes of the tropospheric refraction effect with time, and, thereby, improves the accuracy of baseline resolution.
